|Prunus cerasus (sour cherry) in bloom|
Around 430 species are spread throughout the northern temperate regions of the globe. Many members of the genus are widely cultivated for fruit and ornament. The fruit from this genus are commonly called the stone fruit.
Members of the genus can be deciduous or evergreen. A few species have spiny stems. The leaves are simple, alternate, usually lanceolate, unlobed, and often with nectaries on the leaf stalk. The flowers are usually white to pink, sometimes red, with five petals and five sepals. There are numerous stamens. Flowers are borne singly, or in umbels of two to six or sometimes more on racemes. The fruit is a fleshy drupe (a "prune") with a single relatively large, hard-coated seed (a "stone").
Within the rose family Rosaceae, it was traditionally placed as a subfamily, the Amygdaloideae (incorrectly "Prunoideae"), but was sometimes placed in its own family, the Prunaceae (or Amygdalaceae). More recently, it has become apparent that Prunus evolved from within a much larger clade now called subfamily Amygdaloideae (incorrectly "Spiraeoideae").
In 1737, Carl Linnaeus used four genera to include the species of modern Prunus—Amygdalus, Cerasus, Prunus and Padus—but simplified it to Amygdalus and Prunus in 1758. Since then, the various genera of Linnaeus and others have become subgenera and sections, as it is clearer that all the species are more closely related. Liberty Hyde Bailey says: "The numerous forms grade into each other so imperceptibly and inextricably that the genus cannot be readily broken up into species."
Historical treatments break the genus into several different genera, but this segregation is not currently widely recognised other than at the subgeneric rank. ITIS recognises just the single genus Prunus, with an open list of species,[a] all of which are shown below, under "Species".[b]
One standard modern treatment of the subgenera derives from the work of Alfred Rehder in 1940. Rehder hypothesized five subgenera: Amygdalus, Prunus, Cerasus, Padus and Laurocerasus. To them C. Ingram added Lithocerasus. The six subgenera are described as follows:
- Prunus subgenera:
- Subgenus Amygdalus, almonds and peaches: axillary buds in threes (vegetative bud central, two flower buds to sides); flowers in early spring, sessile or nearly so, not on leafed shoots; fruit with a groove along one side; stone deeply grooved; type species: Prunus dulcis (almond).
- Subgenus Prunus, plums and apricots: axillary buds solitary; flowers in early spring stalked, not on leafed shoots; fruit with a groove along one side, stone rough; type species: Prunus domestica (plum)
- Subgenus Cerasus, cherries: axillary buds single; flowers in early spring in corymbs, long-stalked, not on leafed shoots; fruit not grooved, stone smooth; type species: Prunus cerasus (sour cherry)
- Subgenus Lithocerasus: axillary buds in threes; flowers in early spring in corymbs, long-stalked, not on leafed shoots; fruit not grooved, stone smooth; type species: Prunus pumila (sand cherry)
- Subgenus Padus, bird cherries: axillary buds single; flowers in late spring in racemes on leafy shoots, short-stalked; fruit not grooved, stone smooth; type species: Prunus padus (European bird cherry)
- Subgenus Laurocerasus, cherry-laurels: mostly evergreen (all the other subgenera are deciduous); axillary buds single; flowers in early spring in racemes, not on leafed shoots, short-stalked; fruit not grooved, stone smooth; type species: Prunus laurocerasus (European cherry-laurel)
Another recent DNA study found that there are two clades: Prunus-Maddenia, with Maddenia basal within Prunus, and Exochorda-Oemleria-Prinsepia, but further refinement shows that Exochorda-Oemleria-Prinsepia is somewhat separate from Prunus-Maddenia-Pygeum, and that, like the traditional subfamily Maloideae with apple-like fruits, all of these genera appear to be best considered within the expanded subfamily Amygdaloideae. Prunus can be divided into two clades: Amygdalus-Prunus and Cerasus-Laurocerasus-Padus. Yet another study adds Emplectocladus as a subgenus to the former.
The genus Prunus includes the almond, apricot, cherry, peach and plum, all of which have cultivars developed for commercial fruit and nut production. The almond is not a true nut, the edible part is the seed. Other species are occasionally cultivated or used for their seed and fruit.
Species such as blackthorn (Prunus spinosa), are grown for hedging, game cover, and other utilitarian purposes.
Because of their considerable value as both food and ornamental plants, many Prunus species have been introduced to parts of the world to which they are not native, some becoming naturalised.
Ornamentals include the group that may be collectively called "flowering cherries" (including sakura, the Japanese flowering cherries).
Many species produce an aromatic resin from wounds in the trunk; this is sometimes used medicinally. Other minor uses include dye production.
Pygeum, a herbal remedy containing extracts from the bark of Prunus africana, is used as to alleviate some of the discomfort caused by inflammation in patients suffering from benign prostatic hyperplasia.
Many species are cyanogenic; that is, they contain compounds called cyanogenic glucosides, notably amygdalin, which, on hydrolysis, yield hydrogen cyanide. Although the fruits of some may be edible by humans and livestock (in addition to the ubiquitous fructivory of birds), seeds, leaves and other parts may be toxic, some highly so. The plants contain no more than trace amounts of hydrogen cyanide, but on decomposition after crushing and exposure to air or on digestion, poisonous amounts may be generated. The trace amounts may give a characteristic taste ("bitter almond") with increasing bitterness in larger quantities, less tolerable to people than to birds, which habitually feed on specific fruits.
Pests and diseasesEdit
Various Prunus species are winter hosts of the Damson-hop aphid, Phorodon humuli, which is destructive to hops Humulus lupulus just at the time of their maturity, so it is recommended that plum trees not be grown in the vicinity of hop fields.
Gummosis is a nonspecific condition of stone fruits (peach, nectarine, plum and cherry) in which gum is exuded and deposited on the bark of trees. Gum is produced in response to any type of wound: insects, mechanical injury or disease.
The lists below are incomplete, but include most of the better-known species.
- Prunus africana
- Prunus apetala
- Prunus arborea
- Prunus armeniaca
- Prunus avium
- Prunus bifrons
- Prunus brigantina
- Prunus buergeriana
- Prunus campanulata
- Prunus canescens
- Prunus cerasifera
- Prunus cerasoides
- Prunus cerasus
- Prunus ceylanica
- Prunus cocomilia
- Prunus cornuta
- Prunus crassifolia
- Prunus davidiana
- Prunus darvasica
- Prunus domestica
- Prunus dulcis
- Prunus fruticosa
- Prunus geniculata
- Prunus glandulosa
- Prunus grayana
- Prunus incana
- Prunus incisa
- Prunus jacquemontii
- Prunus japonica
- Prunus korshinskyi
- Prunus kotschyi
- Prunus laurocerasus
- Prunus laxinervis
- Prunus lusitanica
- Prunus maackii
- Prunus mahaleb
- Prunus mandshurica
- Prunus maximowiczii
- Prunus mume
- Prunus murrayana
- Prunus myrtifolia
- Prunus nipponica
- Prunus occidentalis
- Prunus padus
- Prunus persica
- Prunus pleuradenia
- Prunus pseudocerasus
- Prunus prostrata
- Prunus salicina
- Prunus sargentii
- Prunus scoparia
- Prunus serrula
- Prunus serrulata
- Prunus sibirica
- Prunus simonii
- Prunus sogdiana
- Prunus speciosa
- Prunus spinosa
- Prunus spinulosa
- Prunus ssiori
- Prunus subhirtella
- Prunus tenella
- Prunus tomentosa
- Prunus triloba
- Prunus turneriana
- Prunus ursina
- Prunus vachuschtii
- Prunus verecunda
- Prunus × yedoensis
- Prunus zippeliana
- Prunus alabamensis
- Prunus alleghaniensis
- Prunus americana
- Prunus andersonii
- Prunus angustifolia
- Prunus buxifolia
- Prunus caroliniana
- Prunus cortapico
- Prunus cuthbertii
- Prunus emarginata
- Prunus eremophila
- Prunus fasciculata
- Prunus fremontii
- Prunus geniculata
- Prunus gentryi
- Prunus gracilis
- Prunus havardii
- Prunus hortulana
- Prunus huantensis
- Prunus ilicifolia
- Prunus integrifolia
- Prunus maritima
- Prunus mexicana
- Prunus minutiflora
- Prunus murrayana
- Prunus munsoniana
- Prunus myrtifolia
- Prunus nigra
- Prunus pensylvanica
- Prunus pumila
- Prunus rigida
- Prunus rivularis
- Prunus serotina
- Prunus sphaerocarpa
- Prunus subcordata
- Prunus subcorymbosa
- Prunus texana
- Prunus umbellata
- Prunus virginiana
The earliest known fossil Prunus specimens are wood, drupe and seed and a leaf from the middle Eocene of the Princeton Chert of British Columbia. Using the known age as calibration data, recent research by Oh and Potter reconstructs a partial phylogeny of some Rosaceae from a number of nucleotide sequences. According to this study, Prunus and its "sister clade" Maloideae (apple subfamily) diverged at 44.3 mya (or 43 million years ago, well before most of the primates existed). This date is within the Lutetian, or older middle Eocene.[c] Stockey and Wehr report: "The Eocene was a time of rapid evolution and diversification in Angiosperm families such as the Rosaceae ...."
The Princeton finds are among a large number of angiosperm fossils from the Okanagan Highlands dating to the late early and middle Eocene. Crataegus is found at three locations: Mcabee Falls, Idaho; Republic, Washington and Princeton, British Columbia, while Prunus is found at those locations and Quilchena, British Columbia and Chu Chua, British Columbia. A recent recapitulation of research on the topic reported that the Rosaceae were more diverse at higher altitudes. The Okanagan formations date to as early as 52 mya, but the 44.3 mya date, which is approximate, depending on assumptions, might still apply. The authors state: "... the McAbee flora records a diverse early middle Eocene angiosperm-dominated forest.":165
The Online Etymology Dictionary presents the customary derivations of plum and prune from Latin prūnum, the plum fruit. The tree is prūnus; and Pliny uses prūnus silvestris to mean the blackthorn. The word is not native Latin, but is a loan from Greek προῦνον (prounon), which is a variant of προῦμνον (proumnon), origin unknown. The tree is προύμνη (proumnē). Most dictionaries follow Hoffman, Etymologisches Wörterbuch des Griechischen, in making some form of the word a loan from a pre-Greek language of Asia Minor, related to Phrygian.
The first use of Prunus as a genus name was by Carl Linnaeus in Hortus Cliffortianus of 1737, which went on to become Species Plantarum. In that work,[clarification needed] Linnaeus attributes the word to "Varr.", who it is assumed must be Marcus Terentius Varro.[dubious ]
- Do a search in the ITIS database on the scientific name Prunus for its current list.
- Other established species appear as well, which for whatever reasons are not yet in ITIS.
- A date of 76 mya is given for Rosaceae, which is within the late Cretaceous.
- Potter, D.; Eriksson, T.; Evans, R.C.; Oh, S.; Smedmark, J.E.E.; Morgan, D.R.; Kerr, M.; Robertson, K.R.; Arsenault, M.; Dickinson, T.A.; Campbell, C.S. (2007). "Phylogeny and classification of Rosaceae". Plant Systematics and Evolution. 266 (1–2): 5–43. doi:10.1007/s00606-007-0539-9. [Referring to the subfamily by the name "Spiraeoideae"]
- Cullen, J.; et al., eds. (1995). European Garden Flora. 4. Cambridge University Press. ISBN 9780521420952.
- Linnaeus Carolus (1830). Sprengel, Curtius, ed. Genera Plantarum Editio Nona [Plant Categories, Ninth Edition]. Gottingen: Dieterich. pp. 402–403.
- Bailey, Liberty Hyde (1898). Sketch of the Evolution of Our Native Fruits. New York: The MacMillan Company. p. 181.
- Bortiri, E.; Oh, S. H.; Jiang, J.; Baggett, S.; Granger, A.; Weeks, C.; Buckingham, M.; Potter, D.; Parfitt, D. E. (2001). "Phylogeny and Systematics of Prunus (Rosaceae) as Determined by Sequence Analysis of ITS and the Chloroplast trnL-trnF Spacer DNA". Systematic Botany. 26 (4): 797–807. JSTOR 3093861.
- Lee, Sangtae; Wen, Jun (2001). "A phylogenetic analysis of Prunus and the Amygdaloideae (Rosaceae) using ITS sequences of nuclear ribosomal DNA". American Journal of Botany. 88 (1): 150–160. doi:10.2307/2657135. JSTOR 2657135. PMID 11159135.
- Okie, William (July 2003). "Stone Fruits". In Janick, J.; Paulii, R.E. Encyclopedia of Fruits and Nuts. C A B Intl (published 2008).
- Bortiri, Esteban; Oh, Sang-Hun; Gao, Fang-You; Potter, Dan (2002). "The phylogenetic utility of nucleotide sequences of sorbitol 6-phosphate dehydrogenase in Prunus (Rosaceae)" (PDF). American Journal of Botany. 89 (11): 1697–1708. doi:10.3732/ajb.89.10.1697. PMID 21665596. [The specification is ''Emplectocladus'' (Torr.) Sargent]
- "The Gift Of Graft: New York Artist's Tree To Grow 40 Kinds Of Fruit". NPR. 3 August 2014. Retrieved 3 January 2015.
- "This tree produces 40 different types of fruit". ScienceAlert. 21 July 2014. Retrieved 3 January 2015.
- "RHS Plant Selector - Prunus 'Accolade'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Amanogawa'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Ichyo'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Kanzan'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Pandora'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Pink Perfection'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Shirofugen'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Shirotae'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Shogetsu'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Spire'". Retrieved 29 May 2013.
- "RHS Plant Selector - Prunus 'Ukon'". Retrieved 29 May 2013.
- Chladil, Mark; Sheridan, Jennifer (2006). "Fire retardant garden plants for the urban fringe and rural areas" (PDF). www.fire.tas.gov.au. Retrieved 5 December 2017.
- Armstrong, E. Frankland (1913). "Glucosides". In Davis, W.A.; Sadtler, Samuel S. Allen's Commercial Organic Analysis. VII (Fourth ed.). Philadelphia: P. Blakiston's Son & Co. p. 102. Retrieved 5 December 2017.
- Cook, Laurence Martin; Callow, Robert S. (1999). Genetic and evolutionary diversity: the sport of nature (2nd ed.). Cheltenham: Stanley Thornes. p. 135.
- Rothamstead Insect Survey; Rothamstead Research (n.d.). "Damson-hop aphid, Phorodon humuli".
- Benson, N.R.; Woodbridge, C.G.; Bartram, R.D. (1994). "Nutrient Disorders in Tree Fruits" (PDF). Pacific Northwest Extension Publications. Retrieved 9 September 2017.
- Day, Kevin (27 January 1999). "Peach and Nectarine Cork Spot:A Review of the 1998 Season" (PDF). University of California Cooperative Extension - Tulare County. University of California, Davis. Retrieved 9 September 2017.
- Hartman, John; Bachi, Paul (November 2005). "Gummosis and Perennial Canker of Stone Fruits" (PDF). Plant Pathology. University of Kentucky. Retrieved 9 September 2017.
- Stockey, Ruth A.; Wehr, Wesley C. (1996). "Flowering Plants in and around Eocene Lakes of the Interior". In Ludvigson, Rolf. Life in Stone: a Natural History of British Columbia's Fossils. Vancouver: UBCPress. pp. 234,241,245. ISBN 0-7748-0578-1.
- Oh, Sang-Hun; Potter, Daniel (2005). "Molecular phylogenetic systematics and biogeography of tribe Neillieae (Rosaceae) using DNA sequences of cpDNA, rDNA, and LEAFY1". American Journal of Botany. 92 (1): 179–192. doi:10.3732/ajb.92.1.179. PMID 21652396.
- Dillhoff, Richard M; Leopold, Estella B.; Manchester, Steven R. (February 2005). "The McAbee flora of British Columbia and its relation to the Early-Middle Eocene Okanagan Highlands flora of the Pacific Northwest" (PDF). Canadian Journal of Earth Sciences. 42 (2): 151–166. doi:10.1139/e04-084.
- "plum". Online Etymological Dictionary.
- "prune". Online Etymological Dictionary.
- "prūnum". Lewis's Elementary Latin Dictionary. Perseus Digital Library. 1890.
- "prūnus". Lewis's Elementary Latin Dictionary. Perseus Digital Library. 1890.
- "προῦμνον". Liddell and Scott's Greek-English Lexicon. Perseus Digital Library.
- "προύμνη". Liddell and Scott's Greek-English Lexicon. Perseus Digital Library.
- Linnaeus, Carolus (1737). Hortus Cliffortianus. Amsterdam. p. 186. doi:10.5962/bhl.title.690. Retrieved 5 December 2017.
|Wikispecies has information related to Prunus|
|Wikimedia Commons has media related to Prunus.|
- "GRIN Species Records of Prunus". Beltsville, Maryland: USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network (GRIN) [Online Database]. National Germplasm Resources Laboratory. Retrieved 13 November 2009.
- "Our Cherries Collection — Prunus". Missouri Botanical Garden: Kemper Center for Home Gardening. 2001–2009. Retrieved 13 November 2009.
- Tree of 40 fruit website